Night mode is an automatic setting which takes advantage of the new wide-angle camera that's in the iPhone 11 and 11 Pro models. It's equipped with a larger sensor that is able to let in more light, allowing for brighter photos when the light is low.
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Steve Jobs' Stanford 2005 Commencement Speech
Jobs relates stories about his life, including his work at Apple as well as his public departure:
I didn't see it then, but it turned out that getting fired from Apple was the best thing that could have ever happened to me. The heaviness of being successful was replaced by the lightness of being a beginner again, less sure about everything. It freed me to enter one of the most creative periods in my life.
Jobs, of course, later returned to Apple when Apple purchased NeXT (also founded by Steve Jobs).